flyrotary@lancaironline.net Mailing List Archive

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I certainly don't know, Rusty. Like I said the only thing that Tracy and I could conclude was that Mazda was under-rating their injectors - I wondered whether it might have something to do with the way an engine is taxed in Japan.

In any case, Tracy is clearly ignoring our pleas for more information - poor guy is undoubtedly working furiously getting orders completed before Sun & Fun. But, he really shouldn't tease like that {:>)

Yes, I understand what you mean about measured flow rates - I suspect there is something subtle about this matter. Perhaps the current profile used to open the injectors plays some role in this as Tracy indicated he was working on a Fix. Perhaps a two stage or progressive flow rate profile - opens and provides normal flow for typical automobile usage but, when wide open (like ours are at cruise) perhaps the flow rate is more. Who knows - Tracy Crook that's who.

----- Original Message -----

From: Russell Duffy

To: Rotary motors in aircraft

Sent: Friday, March 09, 2007 12:19 AM

Subject: [FlyRotary] Re: The truth??? / Injector flow rate mystery solved

Tracy and I have been discussing this injector flow rate anomaly for years -

For some reason, I was certain that the Mazda injectors flowed more than they were rated for, but after sifting through some old logs, that's not true for all Mazda injectors.   I sent 4 slightly used 550's to RC Engineering, and they tested them at 547, 549, 551, and 551. If that ain't 550, I don't know what is :-)

I guess I'm baffled now. Does Mazda operate them at 5 volts or something, rather than 12V? That would slow down the response time.

Hey the HKS is a good little engine in my opinion - not as good as a light weight rotary (which we don't have yet - Richard! get a move on {:>)), but it'll get you flying again.

Thanks for the comments.  It can't hurt much to try it, because I've already got people who want to buy it if it doesn't work out. Still, it's as much trouble to install as the rotary, so it really comes down to a weight issue, and perhaps whether I'll ever get my redrive from Autoflight...

Rusty